Cushioning handle for pneumatic tools



Juiy 31, 1928.

BYERS I GUSHIONING HANDLE FOR PNEUMATIC TOOL:

2 Sheets-Sheet 1 Filed June 17, 1926 a INVENTOR Stanley 13 Y Y BY WITNESSES ATTORNEYS Patented duly 31;!923.

r is STATES,

summer cums, on BEDFOED', momma.

( QUEHIONING HANLDZLE .FDB INEUMATIG TOOLS,

Application filed June 17, 1926. Serial No. 116,699.'

his invention relates to an improvement inicushioning handlesfor pneumatic tools a such as stone-workm cbisels or the like,

The object of the' nveuticn is to provide a handle tor pneumatic tools which 15 preferably 1n the nature of a casing so as to enclose the barrel of the tool, the handle beving embodied thereina number of springs whichnre interposed between the barrel of the tool and the casing in such a novel and efiectivc manner as to take up and absorb the shocks and ars incident to the chiselmg,

hammering; or other eperation which the tool is carrying out, thereby relieving the operator of thesevere strain which he would undergo were he tobold the barrel or cylinder of the tool directly. o

A further objectis to provide a cushioning 1 luindie having these advantages and cepae ities and which also has embodied therein a novel menus for normally holding the chisel, bit, or nominee in place but out of the field of operation of the piston operating in the barrel of the pneumatic appliance, the means for positioning the chiseh bit or hammer being yieldeble so that when the chisel, bit or hammer is applied to the work-it will be automatically forced back into the field of operation es the pistonoi' hammer operating in the barrel thereby causing operation L of the chisel, bit or hammer;

Other objects and edventages reside in pertain novel features of the construction, I arrangement and comblne-tlon of parts which will be hereinafter more fully described and particularly pointed out in the appended cleim, reference being bad to, the

ncconipenying drewingsforming a part of this specification, and n1 wbichz Figure 1 is a view in side elevation showing a pneumntictcol equipped with ecushtoning handle embodying'the present iiiy ention, I

Figure 2 is a view thereof in central longitudinal section parts being shown in elevetion fort-he seke'oi simplicity and illustmtion,

Figures 3 and 5: are sectional views on the lines 3 3, and 4-"42, respectively, of Figure 2,

Figure 5 is an enlai cd view showing the couplin handle in section and the parts contained dherein in elevation, and

Figure 6 is s fragmentary perspective View of the shank ofthe bit or chisel.

Referring to the drawings wherein for as comp'resscd air 01 the like.

pl ed from an anline5 through a connectioni 6 into a removable head 7 provided atone the sake of illustration the numeral l notes generally a pneumatic tool ofstandard and conventional construction and embody ing a barrel or cylinder 2 having a-working under the action of'the fluid ressure such end of the barrel. The air passes into the working chamber 3 in usualmannen It is to be understood that while the l e'selit in: vention is shown applied to the allett tool. it is not restricted in its application to. this he air. is supno chamber. 3 in which a piston 4 reciprocates particular type of tool but may be usedvin 1:1: any'of the standard or conventionalpnem mctic tools. 1 i The-present invention proposes .the y-provision of an annular shoulder 15 on the out-,

side of the barrel. One end of a coil spring i 16 engages one side of the shoulder 15' an one end of a coil spring 17 engages the oppo-. site side thereof. The coil-springs 16 and 17 are contained within a tubularcushioning handle 18 which also affords a ca'sin for the tool and springs. At its forward end the tubular handle 18 is internally enlarged, as at 19, and one end of this enlargement presents a shoulder 20. The end-of the spring 16 opposite that engaged with the collar 15 engages the'shoulder 20, The tubular handle 18 includes two sections, one designated at 18 and the other designated at 18*, the sections 18 and 18 being threadedly connected, as at 21. The inner end of the section 18 presents a shoulder- 22' with which a washer 23 engages. The washer23 serves as an abutment fo the end of the spring 17 o posits-that ngaged with the collar 15. ith this arran ement the pneumatic tool 1 is shiftable wit in-thc comined casing and handle 18 but its axial shifting movement is restricted by the springs, 16 and 17. B thus mounting the tool within the handle t e shocks and jars in cident to the chiseling, hammering, or other operation, are absorbed and taken up, thereby relieving the operator of the strain which 'would otherwise under 0. Of course, it is to be understood that t e operator in usi the tool grasps the outside of the combin casing and handle 18.

In the forward end of the barrel or cylin m designated at 27. The bit, chisel, or hammer also has a section 28 which is of noncircular form and in the present embodiment is squared. In order to prevent the bit 27 from dropping out of the socket of the handle 18 and out of the socket which the bushing provides, the squared section 28 of the shank thereof has a' peripheral recess 30 of rounded form and this recess 30 is engage by a spring pressed pawl 31 and also y a pivoted 'detent 32, the spring pressed pawl 31 and the pivoted detent 32 being carried by the enlarged portion 19 of the combined handle and easing. When the pawl 31 and detent 32 engage the portion 38 of the shank of the bit, they hold the bit in the position shown in Figure 2, that is, in inoperative position, that is to say the inner end 33 of the shank of the bit is spaced from the outer end 34 of the reduced extension 35 of the piston or hammer. The result of this arrangement is that-even though the piston 4 be reciprocated its reduced extension which constitutes its impact member, will not strike the end 33 of the bit and will not actuate the bit unlcss and until the bit is pressed against the work and its inner end 38 'forced inwardly into the field of operation of the piston or hammer of the pneumatic tool.-

In order to insure the automatic inoperative positioning of the bit a light coil spring 40 is provided, the 001i spr ng 40 engaging the bushing 25 and a shoulder '46 formed at the juncture of the rounded portion 26 and ing element of the pneumatic tool resides in the fact that the bit will not be projected or shot from the tool since it will not be actuated until it is pressed a ainst the work. This advantage isin addition to the cashioning action of the handle.

In combination with a neumatic tool having a barrel, a piston reciprocable in the barrel and harin an impact member at its forward end, sai barrel havin'g a socket a bit having a portion of its shank receivable in the socket and adapted to be engaged with the impact member 01' the piston when pressed inwardl a combined casing and handle enclosing t 1e barrel and havin a socket receiving a portion of the she releasable means co-operable with the bit for holding it in inoperative position out of the field of action of the impact member of the hafnmer, and a spring engaging the barrel of the hammer and the bit to urge the bit outwardly out of the field of operation of the impact member of the hammer until and unless the bit is pressed against the work.

STANLEY BYERS of the bit, I 

